Compressor for gases



March 23 192s." 1,577,594

N. M. SMALL COMPRESSOR FOR GASES- Filed Sept. 24, 1924 Patented Mar. 23,1926.

UNIT-ED STATES PATENT OFFICE.

NORMAN I. SHALL, OI' WLYNESBORO, PENNSYLVANIA, ABBIGNOB TO 1310! COI-rm, OF WAYNEBBOBO, PENNSYLVANIA, CORPORATION OF I'IBRNSYLV ANIA.

conrnnsson non earns.

Application m September :4, 924. Serial n. 799,119.

1 '0 all whom it may concern.-

Be it known that I, NORMAN M. SMALL a citizen of the United States,residing at Waynesboro, in the county of Franklin and State ofPennsylvania, have invented certain new and useful Im rovements inCompressors for Gases, of w ich the following is a specification..-

My said invention relates to compression 0 linders for ammonia or othergases, and t e principal object thereof is to provide variable clearancepockets communicating with the cylinder for regulating the capacity ofthe compressor.

Referring to the accompanying drawings, which are made a art hereof andon which similar reference c aracters indicate similar parts:

Figure l is a vertical section on line 1-1 of Figure 2; and

Figure 2 is a vertical longitudinal section on line 2-2 of Figure 1.

In the drawings reference character 10 indicates the base of thecompressor which is provided with a cylinder 11 containing a anyconventional or piston 12 operated b desired means throug a connectingrod 13. The cylinder is provided with end closures ll, l5, and 16 ofconventional or of any desirable character and has suction openings 17and 18 and dischar e openings 19 and 20, the suction and disc argeopenings being duplicated atthe oposite ends of thecylinder as shown inFigure 2. The discharge manifold is indicated at 21 and'the dischargepipe is connected to a flange shown at 22.

A variable clearance pocket is provided at each end of the cylinder eachof, these pockets consisting of a secondary or subsidiary cylinder 23opening into the main cylinder and closed at the outer end by a plate24.

The plate 24 has a central openin for a rod 25 having at its outer end aban wheel 26 and at its inner end a piston plunger 27 fitting closely inthe cylinder and tapered at its lower end to match the taper of theopening in the wall of the main cylinder so that the pocket may bepractically closed and put out of use. The rod 25 is secured to the pluner 27 to move therewith and is provide at 28 with a threaded portioncooperating with threads in the longitudinal opening of the plate 24 forraising or lowering the plunger.

. its pressure is below that of the suctiongas before the suction valveswill open aud edmitgas from the suction line. The gas in the clearancepocket in expanding partly fills the main cylinder thus reducing thecharge of fresh gas that can be drawn from the suction line andconsequently reducing the capacity of the condenser, the action being,of course, similar at both ends of the same cylinder; While the capacityof the clearance to the nee s of the case it is intended that the spaceshall be large enough to permit a maximum reduction 'of approximately50% in the capacity of the compressor.

l have shown and described a referred embodiment of. the invention butit will be obvious .to those skilled in the art that many chan es can bemade therein without departing from the spirit of the invention,therefore I do notv limit myself to the specific embodiment shown in thedrawings and described in the specification, but only as indicated inthe appended claims.

Having thus fully described my said invention, what I claim as new anddesire to secure by Letters Patent, is:

1. A compressor for as comprising a cylinder, a piston, a cylin ricalclearance pock et opening into the cylinder adjacent the end-of thestroke of the iston, and a plunger in the cylindrical c earance pocketadjustable lengthwise thereof Without stopping the compressor to varythe rate of operation of said compressor, substantially as gockets maybe varied according inder, a piston, a clearance pocket opening into thecylinder adjacent the end of the working stroke of the piston saidpocket extending radially outward from the cylinder, and a plungeradjustable longitudinally of the clearance pocket without interruptingthe action of the compressor to provide a variable chamber underneathsaid plate for varying the rate of operation of the compressor,substantially as set forth.

4; In a gas compressor, a cylinder, a piston, a branch cylinderextending from the main cylinder, a tapered passage leading throu h thecylinder wall from said branch cylin er, and a plunger adjustablelengthwise of the branch cylinder to provide a variable clearance pocketfor varying the rate of operation of the compressor said plunger havinga tapered extension adapted to close said tapere passage. substantiallyas set forth. 4

In witness whereof, I have hereunto set my hand at Waynesboro,Pennsylvania this 23rd day ofiseptember, A. D. nineteen hundred andtwenty-four.

NORMAN M. SMALL.

